1261 - #1300
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Pull request overview
Addresses Issue #1261 by preventing Delta Lake writes from failing when PyArrow infers an all-null column as the unsupported null type during VertiPaq Analyzer “export to table”.
Changes:
- Added a
resolve_null_columns()step to cast all-null PyArrow columns to a supported type (schema-specified type when available, otherwisestring). - In pure-Python notebooks, converts pandas DataFrames to
pyarrow.Tableprior towrite_deltalake, and applies the null-column resolution before writing.
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| data = spark_df | ||
| if isinstance(data, pd.DataFrame): | ||
| data = pa.Table.from_pandas(data, preserve_index=False) | ||
| if isinstance(data, pa.Table): | ||
| data = resolve_null_columns(data) |
whiskyboy
approved these changes
Jul 28, 2026
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#1261